Holmium vs Erbium
Pick up to 3 elements and see how they stack up.
| Property | Holmium | Erbium |
|---|---|---|
| Atomic number | 67 | 68 |
| Atomic mass | 164.93 | 167.26 |
| Electronegativity | 1.23 | 1.24 |
| Melting point | 1,734 K (1,460.8 °C) | 1,802 K (1,528.8 °C) |
| Boiling point | 2,993 K (2,719.8 °C) | 3,141 K (2,867.8 °C) |
| Density | 8.79 g/cm³ | 9.066 g/cm³ |
| Atomic radius | 216 pm | 235 pm |
| Ionization energy | 6.022 eV | 6.108 eV |
| Discovered | 1878 | 1843 |
| Category | Lanthanide | Lanthanide |
| State at room temp. | Solid | Solid |
| Block | f | f |
| Group | — | — |
| Period | 6 | 6 |
| Valence electrons | 2 | 2 |
| Common charges | +3 | +3 |
| Electron configuration | [Xe] 4f11 6s2 | [Xe] 4f12 6s2 |